<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
  <script>
    var arr=[34,56,78,12,90 ,25]
var temp
for(var j=1;j<arr.length;j++)
{
    for(var i=0;i<arr.length-j;i++)
    {
        if(arr[i]>arr[i+1])
        {
            temp=arr[i]
            arr[i]=arr[i+1]
            arr[i+1]=temp
        }
    }
}
console.log(arr);
  </script>  
</body>
</html>